Nik Collection 2 for Lightroom Classic 8.3.1

I upgraded to Lightroom Classic CC 8.3 when it came out. Then I upgraded my Nik Collection 2 from DXO and it appeared in the Edit In as usual. Then I upgraded to Lightroom Classic CC and the version is 8.3.1. Then the name change occurred at some point from Lightroom Classic CC to Lightroom Classic. Nik Collection 2 disappeared. I have tried to rerun the software about 3 times and then it occurred to me that the problem might be the name change. Lightroom Classic CC is the only choice on the list for installation of the Nik Collection 2 plug-in. Suggestions appreciated. The only work around is to go to the External Editing Tab and change the 2nd editor to one of the Nik apps and restart Lightroom.

In Lightroom Classic go File/Plug-in Manager. Look for HDR Efex Pro 2 in the sidebar, click on it. Now you will see the path to the "Modules" folder, where the plugins live, by clicking on "Show In Finder". Do you see the plugin in there? Also, is it "Enabled"? Can you drop it in there manually if it's not there?